基于轴向和切向变速的蜗杆砂轮磨齿齿面纹理改变方法研究

Research on tooth surface texture change method of continuous generating grinding based on axial and tangential variable speed

蜗杆砂轮磨齿是重要的硬齿面精加工方法,但其在工件齿面上会留下不利于啮合噪声表现的平行纹理,在保持其工艺优点的同时,探究齿面纹理改变的方法具有重要意义。文章基于空间曲面啮合原理,结合接触迹和相对速度矢量进行工件齿面磨削纹理仿真;根据齿面纹理与磨削方向的对应关系,定义磨削方向角度对工件齿面纹理进行定量分析;通过建立齿面磨削方向模型,研究轴向和切向速度变化对齿高和齿宽方向上纹理的影响;提出轴向和切向变速的蜗杆砂轮磨齿加工方法,对比分析不同的变速曲线,设计使得相邻接触迹间速度差值最大化的正弦变速函数,建立各加工方法下的齿面磨削方向模型并进行对比。结果表明,该文方法可以在齿高和齿宽方向上改变齿面的磨削速度方向,进而达到改变齿轮纹理的效果。

Continuous generating grinding is an important finishing method of hard tooth surface,but it will leave a parallel texture on the tooth surface of the workpiece that is not conducive to the performance of meshing noise.While maintaining its technological advantages,the method of exploring the change of tooth surface texture is of great significance.Based on the meshing principle of space surface,combined with contact trace and relative velocity vector,the grinding texture simulation of workpiece tooth surface is carried out.According to the corresponding relationship between the tooth surface texture and the grinding direction,the grinding direction angle is defined to quantitatively analyze the tooth surface texture of the workpiece.By establishing a tooth surface grinding direction model,the effects of axial and tangential speed changes on the tooth height and tooth width direction are studied.A continuous generating grinding method for axial and tangential speed changes is proposed,different speed change curves are compared and analyzed,a sinusoidal speed change function that maximizes the speed difference between adjacent contact traces is designed,and the tooth surface grinding direction models under different processing methods are established.The direction models are compared,and the results show that this method can change the direction of the grinding speed of the tooth surface in the direction of tooth height and tooth width,and achieve the effect of changing the gear texture.